已知x+y=5,xy=-3,求(2x—3y—2xy)—(x—4y+xy)的值
人气：300 ℃ 时间：2020-01-26 03:09:17
解答
(2x—3y—2xy)—(x—4y+xy)
=2x-3y-2xy-x+4y-xy
=x+y-3xy
=5-3*(-3)
=5+9=14
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